<template>
  <div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>编辑商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
       <el-alert
    title="修改商品信息" type="warning" center show-icon :closable="false">
      </el-alert>

       <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
        </el-steps>

     <el-form :model="editForm" :rules="editFormRules"
     ref="editFormRef" label-width="100px"
     label-position="top">
      <!-- Tab栏区域 -->
    <el-tabs :tab-position="'left'"
    :before-leave="beforeTabLeave"
    @tab-click="tabClicked"
     v-model="activeIndex">
    <el-tab-pane label="基本信息" name="0">
      <el-form-item label="商品名称"
       prop="goods_name">
       <el-input v-model="editForm.goods_name"></el-input>
       </el-form-item>
       <el-form-item label="商品价格"
       prop="goods_price">
       <el-input v-model="editForm.goods_price"
       type="number"></el-input>
       </el-form-item>
      <el-form-item label="商品重量"
       prop="goods_weight">
       <el-input v-model="editForm.goods_weight"
       type="number"></el-input>
       </el-form-item>
       <el-form-item label="商品数量"
       prop="goods_number">
       <el-input v-model="editForm.goods_number"
       type="number"></el-input>
       </el-form-item>
       <el-form-item label="商品分类" prop="goods_cat">
       <el-cascader
       :show-all-levels="true"
       v-model="editForm.goods_cat"
       :options="cateList"
       expand-trigger="hover"
       :props="cateProps"
        @change="handleChange"></el-cascader>
       </el-form-item>

    </el-tab-pane>
    <el-tab-pane label="商品参数" name="1" >
      <!-- 渲染表单的item项 -->
      <el-form-item v-for="item in manyTableData"
      :key="item.attr_id" :label="item.attr_name">
      <!-- 复选框组 -->
        <el-checkbox-group v-model="item.attr_vals">
        <el-checkbox :label="cb" border
          v-for="(cb,i) in item.attr_vals" :key="i">
        </el-checkbox>
      </el-checkbox-group>
      </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品属性" name="2">
      <el-form-item :label="item.attr_name"
      v-for="item in onlyTableData"
      :key="item.attr_id">
      <el-input v-model="item.attr_vals"></el-input>
      </el-form-item>
    </el-tab-pane>
     <el-tab-pane label="商品图片" name="3">
      <!-- action表示图片要上传到的后台api地址 -->
      <el-upload
      :action="uploadURL"
      :on-preview="handlePreview"
      :on-remove="handleRemove"
      list-type="picture"
      :headers="headerObj"
      :file-list="uploadedList"
      :on-success="handleSuccess">
      <el-button size="small" type="primary">点击上传</el-button>
      </el-upload>
    </el-tab-pane>
     <el-tab-pane label="商品内容" name="4">
      <!-- 富文本编辑器组件 -->
        <quill-editor v-model="editForm.goods_introduce">
        </quill-editor>
        <el-button type="primary" class="btnAdd"
        @click="edit">修改商品</el-button>
    </el-tab-pane>
    </el-tabs>
  </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览"
  :visible.sync="previewVisible" width="50%">
          <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name:"Ed-it",
  data () {
    return {
      // 传递过来的 商品id
      id: this.$route.params.id,
      // 激活的步骤
      activeIndex: '0',
      // 修改商品的表单数据对象
      editForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      editFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 分类列表
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 已经上传了的图片列表
      uploadedList: [],
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的url地址
      uploadURL: 'http://127.0.0.1:8889/api/private/v1/upload',
      // 图片上传组件的 headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getGoodsInfo()
    this.getCateList()
  },
  methods: {
    // 发送请求，查询商品信息
    async getGoodsInfo () {
      const { data: res } = await this.$http.get('goods/' + this.id)

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品信息失败!')
      }
      this.editForm = res.data
      // 设置级联选择器绑定值
      const tempList = res.data.goods_cat.split(',')
      // 这里必须重新赋值为空数组，再赋值，否则v-model不能实现默认值回显
      this.editForm.goods_cat = []
      tempList.forEach(item => {
      // item - 0是把数据类型转换为数字，以与cateList 数据类型一致，否则不能正确回显默认值
        this.editForm.goods_cat.push(item - 0)
      })
      this.editForm.pics.forEach(item => {
        const obj =
      {
        name: item.pics_id + '.jpg',
        url: item.pics_sma_url
      }
        this.uploadedList.push(obj)
      })
      // console.log(res.data);
      
      // this.$message.success('获取商品信息成功!')
    },
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }
      this.cateList = res.data
    },
    // 级联选择器选中项发生变化时，触发的函数
    handleChange () {
      // console.log(this.editFrom.goods_cat)
      if (this.editForm.goods_cat.length !== 3) {
        // 没有选中三级商品分类
        this.editForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' &&
      this.editForm.goods_cat.length !== 3) {
        this.$message.warning('请先选择商品分类!')
        return false
      }
    },
    // 当切换tab页签时触发的函数
    async tabClicked () {
      if (this.activeIndex === '1') {
        // 访问的是 动态参数面板
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'many'
            }
          })

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败!')
        }

        res.data.forEach(item => {
          item.attr_vals =
          item.attr_vals.length === 0 ? []
            : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        
      } else if (this.activeIndex === '2') {
        // 访问的是静态属性面板
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'only'
            }
          })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败!')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      // console.log(file)
      if (file.response) {
        this.previewPath = file.response.data.url
      } else {
        this.previewPath = file.url
      }
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      if (file.response) {
        // 如果存在file.response，则是之后上传的
        const filePath = file.response.data.tmp_path
        const i = this.editForm.pics.findIndex(x =>
          x.pic === filePath)
        this.editForm.pics.splice(i, 1)
      } else {
        // 则是一开始就有图片
        const Url = file.url
        const i = this.editForm.pics.findIndex(x =>
          x.pics_sma_url === Url)
        this.editForm.pics.splice(i, 1)
      }
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push到pics数组中
      this.editForm.pics.push(picInfo)
    },
    // 点击修改商品按钮
    edit () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        const form = _.cloneDeep(this.editForm)
        form.goods_cat = form.goods_cat.join(',')
        console.log(form)

        const { data: res } = await this.$http.put('goods/' + form.goods_id, form)
       
        if (res.meta.status !== 200) {
          return this.$message.error('修改商品失败!')
        }
        this.$message.success('修改商品成功!')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.editForm.goods_cat.length === 3) {
        return this.editForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin:0 10px 0 0 !important
  }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top:15px;
  }
</style>
